<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>文本对齐示例</title>
    <style type="text/css">
        #p1 {
            text-align: left;
        }
        #p2 {
            text-align: center;
        }
        #p3 {
            text-align: right;
        }
    </style>
</head>
<body>
    <p id="p1"><strong>左对齐</strong>:好好学习，天天向上。</p >
    <p id="p2"><strong>居中对齐</strong>:好好学习，天天向上。</p >
    <p id="p3"><strong>右对齐</strong>:好好学习，天天向上。</p >
</body>
</html>